CN102767941A - Greenhouse type solar heat pump combined drying device and method - Google Patents

Abstract

The invention relates to the technical field of solar drying devices, and specifically discloses a greenhouse-type solar heat pump combined drying device and method. The device includes: a greenhouse; a drying bed arranged in the greenhouse; connection, used to absorb the heat of the external medium and use the heat to heat the interior of the greenhouse; the ground radiation mechanism is arranged under the drying bed and is connected to a group of heat pump units; the control center is connected to the two groups of The heat pump unit is connected to control the heat pump unit according to the intensity of solar energy. The invention can save energy and efficiently utilize the heat of solar energy and sewage to heat and dry materials in the greenhouse.

Description

Greenhouse type solar heat pump combined drying device and method

technical field

The invention relates to the technical field of solar drying devices, in particular to a greenhouse-type solar sewage source heat pump combined drying device and method.

Background technique

With the in-depth implementation of energy conservation and emission reduction policies, the use of solar energy is becoming more and more extensive. While developing solar power generation and other methods, the ancient solar thermal utilization has been re-emphasized. The solar energy used in the thermal utilization of solar energy is a low-grade energy. In addition to being used in water heaters, the role of solar energy in the low-temperature (<100°C) drying field is being more and more discovered. Solar drying devices are mainly divided into: greenhouse type, heat collection type and the combination of the two. Among them, the greenhouse of the greenhouse type solar drying device is a drying room, and the drying room directly receives the sun's radiant energy. This drying device is actually a solar greenhouse with moisture removal capacity, and its main point is that the heat collecting component is integrated with the drying chamber. When working, the sunlight directly shines on the items to be dried through the glass cover, and part of the sunlight is absorbed by the greenhouse wall, so the indoor temperature gradually rises, and the evaporated water of the items is taken away by air convection, and discharged from the exhaust chimney to achieve the purpose of drying . However, the heat energy in the exhaust gas of this traditional structure is directly lost and cannot be recycled, and when it is suitable for industrial drying, the energy density is too low and the continuity is poor, which cannot meet the production requirements.

Contents of the invention

(1) Technical problems to be solved

The technical problem to be solved by the invention is how to save energy and efficiently utilize the heat of solar energy and sewage to heat and dry the materials in the greenhouse.

(2) Technical solutions

In order to solve the above technical problems, an embodiment of the present invention provides a greenhouse-type solar-sewage source heat pump combined drying device, including:

greenhouse;

a drying bed, arranged in the greenhouse;

Two sets of heat pump units, connected to the greenhouse, are used to absorb the heat of the external medium and use the heat to heat the inside of the greenhouse;

The ground radiation mechanism is arranged under the drying bed and connected to a group of heat pump units;

The control center is connected with the two groups of heat pump units, and is used to control the heat pump units according to the intensity of solar energy.

Wherein, the heat pump units of the two groups are air source heat pump units and sewage source heat pump units with the same structure, and the heat pump units include:

compressor and expansion valve;

An evaporator and a condenser, the evaporator is connected to the condenser through a compressor and an expansion valve respectively, and the evaporator of the sewage source heat pump unit is also connected to a sewage pipe.

The ground radiation mechanism includes:

surface layer, located below the drying bed;

a filling layer, located below the surface layer;

a heating pipe, located in the filling layer, with both ends protruding from the filling layer;

A water separator and a water collector are respectively connected between the two ends of the heating pipe and the condenser.

In a further technical solution, it also includes: a thermal insulation layer laid under the filling layer; a protective layer laid under the thermal insulation layer.

It also includes: a turbulence fan fixed on the top of the greenhouse through a steel frame.

Further technical solutions also include:

The air return fan is arranged inside the greenhouse, one end of which is provided with an air return port, and the other end is connected to a return air duct, and the other end of the return air duct is an exhaust port, which extends out to the greenhouse through the side wall of the greenhouse. outside;

The fresh air fan is located outside the greenhouse. One end is provided with a fresh air outlet, and the other end is connected to an air supply pipe. The other end of the air supply pipe is an air supply outlet, and extends into the greenhouse through the side wall of the greenhouse.

Also includes:

The heat exchanger is connected to the return air pipe between the return air fan and the evaporator of the air source heat pump unit, and connected to the air supply pipe between the evaporator and the condenser of the air source heat pump unit.

Also includes:

An evaporating pipe, the evaporator of the air source heat pump unit is respectively connected to the return air pipe and the air supply pipe through the evaporating pipe.

Wherein, a second air valve is arranged in the evaporating pipe close to the air return pipe, and a fourth air valve is arranged in the evaporating pipe near the air supply pipe, and both the second air valve and the fourth air valve are connected with the control Central connection; the position between the exhaust port and the second damper is set in the return air duct, and the first damper is set in the position between the fresh air fan and the fourth damper in the air supply duct. Three air valves, the first air valve and the third air valve are connected with the control center.

The greenhouse is provided with a material inlet door and a material outlet door.

A mud turning machine is installed on the drying bed.

Both the water distributor and the water collector are equipped with a balance water tank and a drainpipe.

In order to solve the above technical problems, the present invention also provides a greenhouse-type solar heat pump combined drying method, comprising the following steps:

Step S1. The control center detects whether the solar intensity is greater than the first set value that meets the dehumidification needs of the greenhouse. If yes, execute step S2. Otherwise, judge whether the solar intensity is between the first set value and the second set value. If yes, then Execute step S3; when the solar intensity is lower than the second set value, execute step S4; if the solar intensity is further lower than the third set value, then execute step S5;

Step S2, the control center controls to close the second air valve and the fourth air valve, and judges whether the preset exhaust point is reached, if yes, execute step S21;

Step S21, open the first air valve and the third air valve, the air in the greenhouse is pumped by the return air fan through the return air port and discharged through the return air pipe and the exhaust port, and the air outside the greenhouse is pumped by the fresh air fan through the fresh air port and passed through The air supply pipe and the air supply port are sent into the greenhouse;

Step S3, the control center judges whether the preset exhaust point is reached, and if so, controls the opening of the first air valve to the fourth air valve, and the control center calculates and controls the opening of each air valve according to the intensity of solar energy to determine the opening of the heat pump unit , and determine the flow direction and distribution of return air and supply air to achieve the balance of indoor heat demand and supply;

Step S4, the control center controls to close the first damper and the third damper, opens the second damper and the fourth damper, and controls to turn on the air source heat pump unit;

Step S5, the control center controls to close the first damper and the third damper, opens the second damper and the fourth damper, and controls to turn on the air source heat pump unit and the sewage source heat pump unit.

Wherein, the working steps of the air source heat pump unit in S4 specifically include:

The heat of the hot and humid air from the greenhouse in the air source heat pump evaporator is absorbed by the heat pump working fluid of the air source heat pump evaporator, the moisture in the hot and humid air is condensed and discharged, and the heat pump working fluid of the air source heat pump evaporator enters It is further heated and pressurized in the air source heat pump compressor, and the heated and pressurized heat pump working fluid enters the air source heat pump condenser to exchange heat with the heat pump working medium in the air source heat pump condenser; evaporates in the air source heat pump The dehumidified air in the air source heat pump condenser also enters the air source heat pump condenser to exchange heat with the heat pump working fluid of the air source heat pump condenser. The expansion valve further lowers the temperature and pressure, enters the air source heat pump evaporator to absorb the heat of the hot and humid air in the next round, and the hot air after heat exchange by the air source heat pump condenser is sent into the greenhouse through the air supply port and discharged from the return air fan The hot and humid air in the greenhouse exchanges heat with the air cooled by the air source heat pump evaporator in the preheater.

The working steps of the sewage source heat pump unit in S5 specifically include:

The heat pump working medium in the sewage source heat pump evaporator exchanges heat with the sewage to absorb the heat contained in the sewage. The sewage source heat pump compressor further pressurizes and raises the temperature of the heat pump working medium after heat exchange, and then in the sewage source heat pump condenser The heat pump working medium described in the above transfers heat to the liquid working medium, and the liquid working medium transmits heat to the interior of the greenhouse.

(3) Beneficial effects

The above technical scheme has the following beneficial effects:

1. The present invention belongs to the use of greenhouses as equipment for drying sludge using solar heat, which not only meets the area requirements for collecting solar energy, but also functions as a sludge warehouse, and the cost is much lower than that of solar collectors, which is highly efficient and energy-saving;

2. The present invention uses the heat pump unit as a supplement when solar energy is insufficient, and recovers the heat contained in the sewage of the sewage treatment plant. The efficiency of the heat pump under this working condition will be greatly improved, and the purpose of energy saving is further achieved;

3. The ground radiation heating method makes the bottom temperature inside the sludge higher than the top temperature, which is obviously better than the case where the surface temperature of the sludge is higher than the internal temperature in terms of drying kinetics, and improves the mass transfer (dehumidification) rate.

Description of drawings

Fig. 1 is a schematic structural view of a greenhouse-type solar sewage source heat pump combined drying device according to an embodiment of the present invention;

Fig. 2 is a partial structural schematic diagram of a greenhouse-type solar-sewage source heat pump combined drying device according to an embodiment of the present invention;

Fig. 3 is a partial indoor structure schematic diagram of a greenhouse-type solar-sewage source heat pump combined drying device according to an embodiment of the present invention;

Fig. 4 is a partial structural schematic diagram of the sewage source heat pump unit of the greenhouse-type solar sewage source heat pump combined drying device according to the embodiment of the present invention;

Fig. 5 is a flow chart of a greenhouse-type solar-sewage source heat pump combined drying method according to an embodiment of the present invention.

Among them, 1: greenhouse; 2: return air pipe; 3: air supply pipe; 4: exhaust port; 5: return air port; 6: return air fan; 7: heat exchanger; 8: first air valve; 9: The second air valve; 10: air source heat pump evaporator; 11: fresh air outlet; 12: fresh air fan; 13: third air valve; 14: fourth air valve; 15: air source heat pump condenser; 16: air supply port; 17: sludge material; 18: drying bed; 19: surface layer; 20: filling layer; 21: insulation layer; 22: protective layer; 23: heating pipe; 24: water separator; 25: water pump before water separator ;26: Water collector; 27: Sewage source heat pump condenser; 28: Sewage source heat pump compressor; 29: Sewage source heat pump expansion valve; 30: Sewage source heat pump evaporator; 31: Sewage pump; 32: Sewage pipe; 33 : exhaust pipe; 34: balance water tank; 35: circulating water pump; 36: spoiler fan; 37: mud turning machine; 38: feed door; 39: discharge door; 40: air source heat pump expansion valve; 41: air Source heat pump compressor; 43: evaporation pipe; 44: drainage ditch.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

As shown in Figure 1, it is a schematic structural diagram of a greenhouse-type solar-sewage source heat pump combined drying device according to an embodiment of the present invention. The device includes a greenhouse 1, a drying bed 18 located in the greenhouse 1, a mud turning machine 37 and a flow disturbance fan 36 The return air fan 6 located in the greenhouse 1; the ground radiation mechanism located in the greenhouse 1 is used to conduct the heat from the outside to the greenhouse; the sewage source heat pump unit connected to the ground radiation mechanism located outside the greenhouse 1 is used to absorb The heat from the sewage from the sewage treatment plant is used to heat the water, and the water is used to conduct the heat into the greenhouse 1 . It also includes a heat exchanger 7 located outside the greenhouse 1, an air source heat pump unit, a fresh air fan 12 and a control center (not shown). Wherein the ground radiation mechanism includes heat insulation layer 21, filling layer 20, heating pipe 23, surface layer 19, water separator 24, water collector 26 and water pump; sewage source heat pump unit includes sewage source heat pump compressor 28, sewage source heat pump evaporator 30. Sewage source heat pump expansion valve 29 and sewage source heat pump condenser 27; air source heat pump unit includes air source heat pump compressor 41, air source heat pump evaporator 10, air source heat pump expansion valve 40 and air source heat pump condenser 15.

Among them, the greenhouse 1 is made of PC solar panels, and the greenhouse 1 is provided with an inlet door 38 and an outlet door 39, which are respectively used to send the sludge material 17 into the greenhouse 1, and send the dried sludge material 17 out of the greenhouse 1. .

The greenhouse 1 is provided with a drying bed 18 for placing sludge materials 17 . The bottom of the drying bed 6 is laid with a surface layer 19, which is made of cement mortar, concrete and other materials, and is used to support the drying bed 18; the bottom of the surface layer 19 is a filling layer 20, and the filling layer 20 is used for laying heating pipes 23. To protect the heating pipe 23 and make the temperature uniform, the filling layer 20 is generally made of C15 pea-stone concrete; the bottom of the filling layer 20 is an insulating layer 21, which is used to reduce heat loss in the greenhouse 1, and polystyrene foam can be used Plate production; preferably, a protection layer 22 is laid under the heat insulation layer 21 to prevent groundwater or moisture under the ground from penetrating into the greenhouse 1 through the heat insulation layer 21 .

As shown in Figure 2 again, the two ends of heating pipe 23 stretch out the part of greenhouse 1, and one end is connected with water collector 26 at first, then with drawing from water collector 26 and be connected with sewage source heat pump condenser 27, heating pipe The other end of 23 is first connected with the circulating water pump 35, then leads from the circulating water pump 35 and is connected with the other end of the sewage source heat pump condenser 27, and one end of the sewage source heat pump condenser 27 is connected with the sewage source heat pump compressor 28, and the sewage source heat pump The compressor 28 is connected with the sewage source heat pump evaporator 30, and the sewage source heat pump evaporator 30 is connected with the other end of the sewage source heat pump condenser 27 through the sewage source heat pump expansion valve 29, and the sewage source heat pump evaporator 30 is also respectively connected with the sewage treatment plant The sewage pipe 32 and the sewage pump 31 are connected.

There is a return air fan 6 inside the greenhouse 1, one end of the return air fan 6 is provided with a return air outlet 5, and the other end is connected to the return air duct 2, and the return air duct 2 passes through the side wall of the greenhouse 1 to preheat and exchange heat with the heat pump outside the greenhouse 1 The air return pipe 2 is connected to the heat exchanger 7 and continues to extend, and the other end of the return air pipe 2 is an exhaust port 4. An air source heat pump condenser 15 is installed inside the greenhouse 1. One end of the air source heat pump condenser 15 is provided with an air supply port 16, and the other end is connected to the air supply pipe 3. The air supply pipe 3 passes through the side wall of the greenhouse 1 and the heat exchanger 7 Connect, the air supply pipe 3 continues to extend after connecting the heat exchanger 7, and is connected with the fresh air blower 12, and the other end of the fresh air blower 12 is provided with a fresh air outlet 11.

The air return pipe 2 and the air supply pipe 3 are also connected to the air source heat pump evaporator 10 through the evaporation pipe 43. The position is provided with a fourth damper 14 . A first damper 8 is provided at a position between the air outlet 4 and the second damper 9 in the return duct 2, and a second damper 8 is disposed at a position between the fresh air fan 12 and the fourth damper 14 in the air supply duct 3. Three dampers 13. Each damper is connected with the control center.

The air source heat pump evaporator 10 is also connected to the air source heat pump condenser 15 through the air source heat pump compressor 41 and the air source heat pump expansion valve 40 respectively. The air source heat pump compressor 41 is located inside the greenhouse 1 , and the air source heat pump expansion valve 40 is located outside the greenhouse 1 . The air source heat pump compressor 41 and the air source heat pump expansion valve 40 are connected with the control center.

Again as shown in Figure 3, preferably, on the drying bed 18, a track is arranged at a position between the feed door 38 and the discharge door 39, and a mud turning machine 37 is arranged to move back and forth along the track on the track, constantly destroying the sludge material The dense structure formed by the dry surface of 17 improves the water discharge efficiency. The top of the greenhouse 1 is fixed with a turbulence fan 36 through a steel frame, blowing air to the sludge material 17, so that the air in the greenhouse 1 rolls up and down so that the water is fully diffused therein.

Again as shown in Figure 2, preferably, on the water separator 24 and the water collector 26, a balance water tank 34 and an exhaust pipe 33 are all provided, wherein the balance water tank 34 is used to automatically control the amount of water in the water separator 24. Regulate, exhaust pipe 33 is used for discharging the gas in water.

Preferably, a drainage ditch 44 is provided on the inner wall of the greenhouse 1, and the drainage ditch 44 is used to discharge the condensed water in the greenhouse 1 to the outside.

As shown in Figure 2, for a greenhouse with a long length, using a heating pipe arrangement for water supply and return water will increase the quality requirements and cost, and it will be more difficult to evenly distribute the temperature, so it needs to be divided into several (specific quantity) Depending on the area of the greenhouse), water is supplied and returned to each section, and water separators and water collectors are added to control the flow distribution. The heating pipe can be in a spiral structure.

The principle of the invention is: the greenhouse part discharges the air with high moisture content in the room through natural ventilation to achieve the purpose of drying the sludge material; when the solar energy is insufficient, the heat pump unit, the valve and the water pump of the heating pipe cycle are turned on to achieve uniform heating The role of the greenhouse floor. The heat pump is mainly used to recycle the low-grade heat absorbed from the sewage heat source into high-grade heat and supply it to the greenhouse through the ground.

As shown in Figure 4, taking the sewage source heat pump unit as an example, the working principle of the heat pump unit in this embodiment is: the sewage in the sewage pipe 32 enters the sewage source heat pump evaporator 30 under the action of the sewage pump 31, and the sewage source The heat pump working fluid in the heat pump evaporator 30 exchanges heat with the sewage. The heat pump working fluid absorbs the heat of the sewage and enters the sewage source heat pump compressor 28. The compressor 28 compresses the heat pump working fluid into a state of high temperature and high pressure, and then the compressed The heat pump working medium enters the sewage source heat pump condenser 27 to exchange heat with the liquid working medium, and the liquid working medium in this embodiment is specifically water. The heat pump working fluid releases heat in the sewage source heat pump condenser 27 to feed water. The heated water enters the water separator 24 through the circulating water pump 35, and further enters the heating pipe 23 through the water pump 25. The water in the heating pipe 23 and its surroundings The filled layer 20 performs heat exchange, and the water after heat exchange enters into the water collector 26, and the water in the water collector 26 enters into the sewage source heat pump condenser 27 to perform another round of heat cycle. The heat pump working fluid from the sewage source heat pump condenser 27 enters the sewage source heat pump expansion valve 29 for cooling and pressure reduction, and then enters the sewage source heat pump evaporator 30 for the next cycle.

As shown in Figure 5, it is a flow chart of the greenhouse-type solar heat pump combined drying method of the embodiment of the present invention, that is, the working principle of the device of the present invention, including the following steps:

Step S1. The control center detects whether the solar intensity is greater than the first set value that meets the dehumidification needs of the greenhouse. If yes, execute step S2. Otherwise, judge whether the solar intensity is between the first set value and the second set value, then execute Step S3; when the solar intensity is lower than the second set value, execute step S4; if the solar intensity is further lower than the third set value, execute step S5;

Wherein the third set value is smaller than the second set value;

Step S2, the control center controls to close the second air valve and the fourth air valve, and judges whether the preset exhaust point is reached, if yes, execute step S21;

Step S21, open the first air valve and the third air valve, the air with high temperature and high humidity in the greenhouse is drawn by the return air fan through the return air outlet, and is discharged through the return air pipe and the exhaust port, and the air with low temperature and low humidity outside the greenhouse The air is pumped by the fresh air fan through the fresh air outlet and sent into the greenhouse through the air supply pipe and the air supply outlet;

This part of fresh air is heated by solar energy in the greenhouse, and then becomes high-temperature and high-humidity air. When it is discharged, it takes away the moisture in the sludge to achieve the purpose of dehumidification.

Step S3, the control center determines whether the preset exhaust point is reached, and if so, controls the opening of the first air valve to the fourth air valve, and the control center calculates and controls the opening degree of each air valve according to the solar energy intensity, and determines the return air, air supply The flow direction and distribution of wind can realize the balance of indoor heat demand and supply.

Step S4, the control center controls to close the first air valve and the third air valve, open the second air valve and the fourth air valve, and control to open the air source heat pump unit: the heat of the hot and humid air from the greenhouse in the air source heat pump evaporator is The heat pump working fluid of the air source heat pump evaporator absorbs, the moisture in the hot and humid air condenses and is discharged, and the heat pump working fluid of the air source heat pump evaporator enters the air source heat pump compressor to be further heated and pressurized, and the heated and pressurized The heat pump working fluid enters the air source heat pump condenser and exchanges heat with the heat pump working fluid in the air source heat pump condenser; the dehumidified air in the air source heat pump evaporator also enters the air source heat pump condenser to exchange heat with the air The heat pump working fluid in the condenser of the source heat pump performs heat exchange, and the temperature of the heat pump working medium in the condenser of the air source heat pump decreases. Absorb the heat of hot and humid air, and the hot air after heat exchange by the air source heat pump condenser is sent into the greenhouse through the air supply port; at the same time, the hot and humid air discharged from the return fan in the greenhouse and the air cooled by the evaporator are in the preheater A round of heat exchange is also carried out to make full use of the heat of the hot and humid air in the greenhouse.

Step S5, the control center controls to close the first damper and the third damper, opens the second damper and the fourth damper, and controls to turn on the air source heat pump unit and the sewage source heat pump unit;

Wherein the working process of the air source heat pump unit has been described in step S4;

For the sewage pump heat pump unit, its working process is: the sewage in the sewage pipe enters the sewage source heat pump evaporator under the action of the sewage pump, the heat pump working medium in the sewage source heat pump evaporator exchanges heat with the sewage, and the heat pump working medium absorbs the sewage heat, and enter the sewage source heat pump compressor to compress the heat pump working medium into a state of high temperature and high pressure, and then the compressed heat pump working medium enters the sewage source heat pump condenser to exchange heat with the liquid working medium. The liquid working medium in this embodiment It is specifically water. The heat pump working fluid releases heat to feed water. The heated water enters the water separator through the water pump, and is further pumped into the heating pipe through the water pump. The water in the heating pipe exchanges heat with the filling layer around the heating pipe. The heated water enters the water collector, and the water in the water collector enters the condenser for another round of heat cycle. The heat pump working fluid from the sewage source heat pump condenser enters the sewage source heat pump expansion valve for further cooling and pressure reduction, and then enters the sewage source heat pump evaporator for the next cycle.

As can be seen from the above examples, the device provided by the present invention has the following beneficial effects:

1. The present invention belongs to the use of greenhouses as equipment for drying sludge using solar heat, which not only meets the area requirements for collecting solar energy, but also functions as a sludge warehouse, and the cost is much lower than that of solar collectors, which is highly efficient and energy-saving;

2. The present invention uses the heat pump unit as a supplement when solar energy is insufficient, and recovers the heat contained in the sewage of the sewage treatment plant. The efficiency of the heat pump under this working condition will be greatly improved, and the purpose of energy saving is further achieved;

3. The ground radiation heating method makes the bottom temperature inside the sludge higher than the top temperature, which is obviously better than the case where the surface temperature of the sludge is higher than the internal temperature in terms of drying kinetics, and improves the mass transfer (dehumidification) rate.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and modifications can also be made, these improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (15)

1. greenhouse type combined solar energy heat pump drying device is characterized in that, comprising:

The greenhouse;

Drying bed is arranged in the said greenhouse;

Two groups of source pump are connected with said greenhouse, are used to absorb the heat of extraneous medium and utilize this heat that inside, greenhouse is heated;

Terrestrial surface radiation mechanism is arranged on the below of said drying bed, is connected with one group of said source pump;

Control centre is connected with two groups of said source pump, is used for according to solar energy intensity said source pump being controlled.

2. greenhouse type combined solar energy heat pump drying device as claimed in claim 1 is characterized in that, two groups of said source pump are identical net for air-source heat pump units of structure and sewage source heat pump unit, and said source pump comprises:

Compressor and expansion valve;

Evaporimeter and condenser, said evaporimeter are connected with condenser with expansion valve through compressor respectively, and the evaporimeter of said sewage source heat pump unit also is connected with sewage pipe.

3. greenhouse type combined solar energy heat pump drying device as claimed in claim 2 is characterized in that, said terrestrial surface radiation mechanism comprises:

Surface layer is positioned at the below of said drying bed;

Packed layer is positioned at the below of said surface layer;

Heating tube is arranged in said packed layer, and said packed layer is stretched out at its two ends;

Water knockout drum and water collector are connected between the two ends and said condenser of said heating tube.

4. greenhouse type combined solar energy heat pump drying device as claimed in claim 3 is characterized in that, also comprises:

Heat insulation layer is laid on the below of said packed layer;

Overcoat is laid on the below of said heat insulation layer.

5. greenhouse type combined solar energy heat pump drying device as claimed in claim 1 is characterized in that, also comprises: the flow-disturbing blower fan is fixed on said greenhouse inner top through steelframe.

6. greenhouse type combined solar energy heat pump drying device as claimed in claim 1 is characterized in that, also comprises:

Return air fan, it is inner to be arranged on said greenhouse, and the one of which end is provided with return air inlet, and the other end takes back airduct, and the other end of said backwind tube is an exhaust outlet, the sidewall that passes said greenhouse reaches outside the greenhouse;

New wind blower fan, it is outside to be positioned at said greenhouse, and the one of which end is provided with fresh wind port, and the other end is met and sent off airduct, and the other end of said ajutage is an air outlet, the sidewall that passes said greenhouse extend in the greenhouse.

7. greenhouse type combined solar energy heat pump drying device as claimed in claim 6 is characterized in that, also comprises:

Heat exchanger is connected on the backwind tube between the evaporimeter of said return air fan and net for air-source heat pump units, and is connected on the evaporimeter and the ajutage between the condenser of said net for air-source heat pump units.

8. greenhouse type combined solar energy heat pump drying device as claimed in claim 6 is characterized in that, also comprises:

Evaporation tube, the evaporimeter of said net for air-source heat pump units connects backwind tube and ajutage respectively through evaporation tube.

9. greenhouse type combined solar energy heat pump drying device as claimed in claim 8; It is characterized in that; Be provided with second air-valve in the evaporation tube near said backwind tube, be provided with the 4th air-valve in the evaporation tube near said ajutage, said second air-valve all is connected with control centre with the 4th air-valve; Position in the said backwind tube between the exhaust outlet and second air-valve is provided with first air-valve, and the position in the said ajutage between new wind blower fan and the 4th air-valve is provided with the 3rd air-valve, and said first air-valve all is connected with control centre with the 3rd air-valve.

10. greenhouse type combined solar energy heat pump drying device as claimed in claim 1 is characterized in that said greenhouse is provided with feeding gate and discharge door.

11. greenhouse type combined solar energy heat pump drying device as claimed in claim 1 is characterized in that, the mud machine that turns over is installed on the said drying bed.

12. greenhouse type combined solar energy heat pump drying device as claimed in claim 1 is characterized in that, balanced reservoir and drainpipe all are installed on said water knockout drum and the water collector.

13. greenhouse type combined solar energy heat pump drying means is characterized in that, comprises the steps:

Whether step S1, control centre detect solar energy intensity greater than first setting value that satisfies greenhouse dehumidifying needs, are execution in step S2 then, otherwise judge solar energy intensity whether between first setting value and second setting value, are execution in step S3 then; When solar energy intensity is lower than second setting value, execution in step S4; Be lower than the 3rd setting value further as if solar energy intensity, then execution in step S5;

Second air-valve and the 4th air-valve are closed in the control of step S2, control centre, and judge whether to reach preset release, are execution in step S21 then;

Step S21, unlatching first air-valve and the 3rd air-valve, the air in the greenhouse are pumped by return air fan through return air inlet and are discharged through backwind tube and exhaust outlet, and the air outside the greenhouse is pumped by new wind blower fan through fresh wind port and sent in the greenhouse through ajutage and air outlet;

Step S3, control centre judge whether to reach preset release; Be then to control first air-valve to the, four air-valves all to open; Calculate and control the aperture of each air-valve according to solar energy intensity by control centre; The unlatching of decision source pump, and the flow direction and the distribution of definite return air, air-supply realize indoor heat demand balance between supply and demand;

First air-valve and the 3rd air-valve are closed in step S4, control centre's control, open second air-valve and the 4th air-valve, and net for air-source heat pump units are opened in control;

First air-valve and the 3rd air-valve are closed in step S5, control centre's control, open second air-valve and the 4th air-valve, and net for air-source heat pump units and sewage source heat pump unit are opened in control.

14. greenhouse type combined solar energy heat pump drying means as claimed in claim 13 is characterized in that, the job step of said S4 hollow source of the gas source pump specifically comprises:

Heat from the damp-heat air in greenhouse in the air source heat pump evaporation device is absorbed by the heat pump fluid of said air source heat pump evaporation device; Hydrogenesis in the damp-heat air is also drained; The heat pump fluid of said air source heat pump evaporation device enters into the air source heat pump compressor and is further heated pressurization; Heat pump fluid after the heating and pressurizing enters into the air source heat pump condenser, carries out heat exchange with heat pump fluid in the air source heat pump condenser; The air that in air source heat pump evaporation device, is dehumidified also enters into the air source heat pump condenser; Carry out heat exchange with the heat pump fluid of air source heat pump condenser; The heat pump fluid temperature of air source heat pump condenser reduces; Heat pump fluid after temperature reduces is through expansion valve decrease temperature and pressure further; Get into the heat that air source heat pump evaporation device carries out next round absorption damp-heat air, the hot-air after the heat exchange of air source heat pump condenser is sent in the greenhouse through air outlet, preheater, carries out heat exchange from the damp-heat air in the greenhouse that return air fan is discharged and the air of lowering the temperature through air source heat pump evaporation device.

15. greenhouse type combined solar energy heat pump drying means as claimed in claim 13 is characterized in that the job step of sewage source heat pump unit specifically comprises among the said S5:

Heat pump fluid in the sewage source heat pump evaporimeter and sewage carry out heat exchange; Absorb sewage institute heat content; The temperature raising of further pressurizeing of the heat pump fluid of sewage source heat pump compressor after to heat exchange; Then at heat pump fluid described in the sewage source heat pump condenser with the heat transferred liquid working substance, liquid working substance is inner with the heat transferred greenhouse.

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